I Really don't know what to think of this. (By the eagles feet) I have 2 of the same year with the same issue. Help appreciated!
are you pointing out the arrow quiver tie ?? please explain more ... below from https://www.usacoinbook.com/us-coins/1998-p-washington-quarter.jpg
This is not an area where you should see damage from a die clash. It is an area that is the high point of the die, it does look like the die received some damage in that area, but I could only speculate what from. Some of it looks like die abrasion from the feeder fingers but there seem to be more than that doing on, in what should be a smooth field on the coin, apart from the area between his legs.
Would such feeder finger scrapes happen before or after the coin was struck? Forensic logic would indicate that if the scrapes happen before the coin was struck, the tail feathers would be visible over the scrapes. If the scrapes happen after the coin was struck, the scrapes would be visible over the tail feathers and possibly over other features of the image, such as the lower leg, etc. There is no evidence of scrapes over the leg. For these reasons, I think it has to do with the die being damaged in some way. But if it were to be damaged, there would be other quarter examples with the exact same issue.